Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions

Do reactions of photosynthesis called, as ‘Dark Reaction’ need light? Explain.

Is it correct to say that photosynthesis occurs only in leaves of a plant? Besides leaves, what are the other parts that may be capable of carrying out photosynthesis? Justify.

The entire process of photosynthesis consists of a number of reactions. Where in the cell do these take place?

Synthesis of ATP and NADPH ______

The entire process of photosynthesis consists of a number of reactions. Where in the cell do these take place?

Synthesis of sugar molecule ______

The entire process of photosynthesis consists of a number of reactions. Where in the cell do these take place?

Synthesis of starch ______

Which property of the pigment is responsible for its ability to initiate the process of photosynthesis? Why is the rate of photosynthesis higher in the red and blue regions of the spectrum of light?

In the figure given below, the black line (upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll a. Answer the following:

1. What does the action spectrum indicate? How can we plot an action spectrum?
2. How can we derive an absorption spectrum for any substance?

While eating watermelons, all of us wish it was seedless. As a plant physiologist can you suggest any method by which this can be achieved.

Algae are known to reproduce asexually by variety of spores under different environmental conditions. Name these spores and the conditions under which they are produced.

What is the epidermal cell modification in plants which prevents water loss?

What are the cells that make the leaves curl in plants during water stress?

Point out the differences in the anatomy of, leaf of peepal (Ficus religiosa) and maize (Zea mays). Draw the diagrams and label the differences.

Palm is a monocotyledonous plant, yet it increases in girth. Why and how?

Reaction given below is catalysed by oxidoreductase between two substrates A and A’, complete the reaction.

A reduced + A’ oxidised `→`

The C₄ plants are twice as efficient as C₃ plants in terms of fixing CO₂ but lose only ______ as much water as C₃ plants for the same amount of CO₂ fixed.

In a girdled plant, when water is supplied to the leaves above the girdle, leaves may remain green for sometime then wilt and ultimately die. What does it indicate?

Give a comparative account of the classes of Kingdom Fungi under the following:

1. Mode of nutrition
2. Mode of reproduction

Describe the internal structure of a dorsiventral leaf with the help of labelled diagrams.

What essential role does the root endodermis play during mineral absorption in plants?

Explain why xylem transport is unidirectional and phloem transport bi-directional.